A Single-Stage Capacitive AC-Link AC–AC Power Converter
A Single-Stage Capacitive AC-Link AC–AC Power Converter
复制标题
单级电容式 AC-Link AC-AC 电源转换器
DOI：
10.1109/tpel.2018.2841398
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发表时间：
2019
影响因子：
6.7
通讯作者：
M. Amirabadi
中科院分区：
文献类型：
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作者：
E. Afshari;M. Khodabandeh;M. Amirabadi
提出了一种利用高频交流母线电压的单级三相交-交变换器。在这种转换器中，由于链路的高频交流电压，一个非常小的薄膜电容器可以将能量从输入端传输到输出端。这消除了对通常用于直流链路AC-AC转换器中的大型电解电容器的需要。此外，在需要隔离的情况下，链路处的紧凑型高频Transformer可以取代笨重的低频变压器。这些功能增加了功率密度，以及所提出的转换器的可靠性相比，传统的直流环节转换器。在建议的转换器中所需的开关的数量是12，这是小于矩阵转换器中所需的开关的数量，从而导致较低的开关和导通损耗。尽管是单级的，所提出的交流-交流转换器是能够升压和降压的电压和频率变换。这消除了使用级联功率转换器的需要。在本文中，建议的交流-交流转换器的工作原理进行了研究，并介绍了可变开关频率和固定开关频率控制方法操作这种转换器。通过仿真和实验验证了变换器的性能。
A single-stage three-phase ac–ac converter benefiting from a high-frequency alternating link voltage is proposed in this paper. In this converter, a very small film capacitor can transfer the energy from the input to the output, owing to the high-frequency alternating voltage of the link. This eliminates the need for large electrolytic capacitors that are typically used in dc-link ac–ac converters. Moreover, a compact high-frequency transformer at the link can replace the bulky low-frequency transformers, in case isolation is required. These features increase the power density as well as reliability of the proposed converter in comparison with the conventional dc-link converters. The number of required switches in the proposed converter is 12, which is less than the number of switches needed in matrix converters, leading to lower switching and conduction losses. Despite being single-stage, the proposed ac–ac converter is capable of both stepping up and stepping down the voltage and also frequency transformation. This eliminates the need for using cascaded power converters. In this paper, the operation principles of the proposed ac–ac converter are investigated, and variable switching frequency and fixed switching frequency control methods for operating this converter are introduced. The performance of the converter is verified through simulation and experiment.